On Wed, 29 Nov 2006 17:22:10 -0600 Wenji Wu <[EMAIL PROTECTED]> wrote:
> From: Wenji Wu <[EMAIL PROTECTED]> > > Greetings, > > For Linux TCP, when the network applcaiton make system call to move data > from > socket's receive buffer to user space by calling tcp_recvmsg(). The socket > will > be locked. During the period, all the incoming packet for the TCP socket > will go > to the backlog queue without being TCP processed. Since Linux 2.6 can be > inerrupted mid-task, if the network application expires, and moved to the > expired array with the socket locked, all the packets within the backlog > queue > will not be TCP processed till the network applicaton resume its execution. > If > the system is heavily loaded, TCP can easily RTO in the Sender Side. > > Attached is the detailed description of the problem and one possible > solution. Thanks. The attachment will be too large for the mailing-list servers so I uploaded a copy to http://userweb.kernel.org/~akpm/Linux-TCP-Bottleneck-Analysis-Report.pdf >From a quick peek it appears that you're getting around 10% improvement in TCP throughput, best case. - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
